/Engine/Source/Runtime/AudioMixer/Public/AudioMixerBlueprintLibrary.h
Start spectrum analysis of the audio output.Byleaving the Submix To Analyze blank, you can analyze the master output of the game.
static void StartAnalyzingOutput ( const [UObject](API\Runtime\CoreUObject\UObject\UObject) * WorldContextObject, [USoundSubmix](API\Runtime\Engine\Sound\USoundSubmix) * SubmixToAnalyze, EFFTSize FFTSize, EFFTPeakInterpolationMethod InterpolationMethod, EFFTWindowType WindowType, float HopSize, EAudioSpectrumType SpectrumType )